EP2534040B1 - Station de chargement avant à double pont pour liquide cryogénique - Google Patents

Station de chargement avant à double pont pour liquide cryogénique Download PDF

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Publication number
EP2534040B1
EP2534040B1 EP11702475.2A EP11702475A EP2534040B1 EP 2534040 B1 EP2534040 B1 EP 2534040B1 EP 11702475 A EP11702475 A EP 11702475A EP 2534040 B1 EP2534040 B1 EP 2534040B1
Authority
EP
European Patent Office
Prior art keywords
cryogenic
floating
tanker
bow
offshore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP11702475.2A
Other languages
German (de)
English (en)
Other versions
EP2534040A1 (fr
Inventor
Jean-Robert Fournier
Priscilla Hoedemaker
Laurent LE TOUZÉ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Single Buoy Moorings Inc
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Single Buoy Moorings Inc
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Filing date
Publication date
Application filed by Single Buoy Moorings Inc filed Critical Single Buoy Moorings Inc
Priority to EP11702475.2A priority Critical patent/EP2534040B1/fr
Publication of EP2534040A1 publication Critical patent/EP2534040A1/fr
Application granted granted Critical
Publication of EP2534040B1 publication Critical patent/EP2534040B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
    • B63B27/24—Arrangement of ship-based loading or unloading equipment for cargo or passengers of pipe-lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
    • B63B27/30—Arrangement of ship-based loading or unloading equipment for transfer at sea between ships or between ships and off-shore structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
    • B63B1/06—Shape of fore part
    • B63B1/063—Bulbous bows
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/10—Measures concerning design or construction of watercraft hulls

Definitions

  • the invention relates to an offshore cryogenic offloading system that lies in a sea having a sea surface and a sea floor, wherein cryogenic fluid is transferred between two floating units in a bow to stem configuration comprising a floating structure that lies at the sea surface and comprises processing units, a floating tanker that lies at the sea surface and transports the cryogenic fluids from one location to another, at least one cryogenic transfer hose that extends from the stem of said floating structure to the bow of said floating tanker to carry cryogenic fluids from one to the other, at least one vapor return line that extends from the stem of the floating structure to the bow of the floating tanker to carry the boil-off vapor from the floating tanker to the floating structure in normal operations.
  • the invention also relates to a method of transferring LNG in a bow to stem configuration between two floating units.
  • Liquefied Natural Gas may be produced at seabed-supported platforms or spread moored or turret moored LNG liquefaction barges (FLNG) and is transferred from the production/processing site to cryogenic carriers.
  • the LNG carriers may be vessels that are moored to an offshore liquefaction barge in a tandem configuration, via hawsers connecting the bow of the LNG carrier to the stem of the liquefaction barge and that are kept in position by dynamic positioning and the use of their thrusters.
  • a flexible cryogenic hose connects at one end to a manifold at the bow of the carrier and at another end to a crane boom on the barge. Tandem offloading solutions are preferred as inherently safer compared to side by side approaches from an operational perspective in severe offshore conditions.
  • WO 00/02773 discloses a bow loading arrangement for shuttle tanker where the mooring winch drum and hose handling winch drum are operated both together and independently of each other by the same drive unit.
  • the winch may be placed on the main deck, and by using guide pulleys both the hose handling rope and the mooring hawser can be guided to the respective drums. It is an object to obtain or improve a clearance between the hose transfer lines and the mooring equipment means used to moor the two vessels in a tandem configuration.
  • the object of the present invention is achieved by providing an offshore cryogenic offloading system as defined by claim 1
  • the floating structure can in addition be provided with a heading control system.
  • An additional object of the present invention is to provide at the stem of the floating structure, one storage reel per transfer line, with at least one of the storage reels having a cross section showing flat sections to accommodate the cryogenic hose end fitting.
  • a further object of the present invention is to provide a method of transferring a cryogenic media such as LNG in an offshore bow to stem configuration between two floating units, this method also offering the possibility to install each transfer line independently one from the other.
  • processing units any kind of units onboard a vessel such as a liquefaction unit, a regasification unit, etc...
  • cryogenic fluid any kind of very cold fluids such as liquefied CO 2 , Liquefied Petroleum Gas (LPG) and any kind of cryogenic fluids such as LNG.
  • LPG Liquefied Petroleum Gas
  • cryogenic fluids such as LNG.
  • the wording 'fluid' must be understood as fluid in a liquid phase or fluid in a gas phase.
  • FIG. 1 shows a top view of an FPSO vessel 1 and an LNG tanker 2 interconnected by three flexible LNG pipes or fluid transfer lines 3a, 3b and 3c extending between the vessel 1 and the tanker 2.
  • One of the three fluid transfer lines is referred as a vapor return line and the others as fluid product transfer lines.
  • the FPSO vessel 1 and the LNG tanker 2 are in a bow to stem tandem configuration with the LNG tanker's bow moored with two mooring hawsers 4, in a twin arrangement between vessels centerlines, to the FPSO vessel's stem.
  • the floating unit 1 is an FPSO vessel comprising a liquefaction plant 5.
  • the floating unit 1 could have been of another type such as a Floating Storage and Regasification Unit (FSRU) comprising as a processing unit a regasification unit.
  • FSRU Floating Storage and Regasification Unit
  • the FPSO Floating Storage and Regasification Unit
  • the LNG pipes 3a, 3b and 3c are each connected to a LNG pipe connector 7a, 7b and 7c (shown in dashed point in FIG.1 ).
  • the bow of the LNG tanker 2 is provided with a bow loading station 9 comprising at least a fluid connection deck placed on the top of the bow upper deck where the LNG pipe connector 7a, 7b and 7c are located. All the tanker mooring equipment such as winches and quick release hooks are located on the bow loading station 9 at the tandem mooring offloading deck placed on top of the fluid connection deck.
  • the floating tanker 2 comprising LNG storage tanks 10 is specifically configured to carry LNG over an ocean or other large water body and there is at least one mooring line extending from the seabed to moor the floating structure.
  • FIG.2A shows a side view of the embodiment of FIG.1 .
  • the two vessels are also moored one to the other, in a bow to stem offloading configuration, via hawsers 4.
  • the LNG transfer lines are floating cryogenic pipes 3a, 3b and 3c.
  • the transfer lines are provided with buoyancy modules 11, only the ones located near the LNG connectors 7 are shown in FIG.2A but there could be buoyancy modules placed along the whole length of the transfer pipes 3.
  • the transfer lines 3 pass through guiding platforms 15 which are located at the stem of the LNG FPSO 1 below the storage reels 6.
  • FIG.2A shows also that the bow loading station 9 enables the LNG pipes connectors 7 to be placed further behind the vertical projection of the bulb 20 of the tanker 2. Therefore, the minimal distance between the transfer lines 3 and the bulb 20 of the tanker 2 is at least four meters.
  • the bulb 20 of the tanker 2 is arranged in the bow portion of the tanker 2 to be relocatable in order to ensure enough clearance between the fluid transfer lines 3 and the hull of the floating tanker 2.
  • the bulb 20 of the tanker 2 is arranged to be turned away from the bow portion of the tanker 2 during the loading/offloading through the fluid transfer lines 3.
  • the bulb 20 of the tanker 2 is arranged to be located in the bow portion of the tanker 20 during sailing.
  • the distance between the two vessels is approximately ninety five meters.
  • the tanker 2 is provided with bow thrusters 12 and the LNG FPSO 1 with azimuthal thrusters 13.
  • Thrusters enable the vessels to be provided with dynamic positioning (DP), a computer controlled system to automatically maintain the vessels' position and heading.
  • the heading control capacity on the LNG FPSO 1 allows rotating the vessel toward the swell and limits the resulting dynamic response of the lines 3.
  • the DP capacity on the tanker 2 allows controlling both the static offset (radial and angular) and limits as well the resulting lines dynamic by controlling the tanker heading.
  • FIG.2B shows an asymmetric tandem offloading arrangement according to another embodiment of the present invention.
  • the three connecting points 7 are at one side of the tanker 2, hence keeping the lines 3 safe from the bulb 20 of the tanker 2.
  • This arrangement also gives the possibility to position the connectors 7 closer to the hull.
  • the bow loading station required is less massive and hence less expensive.
  • the bow loading station is also placed more aft wards which guarantees more easily a good visibility.
  • the tanker 2 is better positioned for Emergency disconnection and emergency sail away. Further in that position the tanker 2 benefits of an ideal dynamic response of the lines 3 due to the protecting effect on swell of the LNG FPSO 1.
  • FIG. 3 shows an isometric view of the piping at the bow of the floating tanker 2 when the transfer lines 3 are connected.
  • This figure clearly shows that the fluid transfer lines 3 are connected via a fluid connector 21 that is provided with an emergency release system and quick coupling decoupling system 22.
  • This fluid connector is also combined with a structural connector 23 providing load diverting means and mechanical clamps 24 to ensure the connection of the line with the fluid connector 22.
  • the piping comprises an expansion loop 25 followed by two swivels 26 and 27 and finally directed toward the LNG storage tanks (not shown).
  • some of the mooring equipment such as the mooring winches 28 and the hawsers fairleads 29 appear above the piping.
  • FIG. 4A shows a front view of the bow of the floating tanker 2 according to the present invention, with a bow loading station 9 comprising a fluid connection deck 16 placed on the top of the bow upper deck 17 and FIG. 4B shows a rear isometric view of the bow of the floating tanker 2 with the third level comprising a tandem mooring offloading deck 19 placed on top of the fluid connection deck 16.
  • the mooring equipment of the floating tanker 2 is located above the piping and hence above the fluid connection deck 16.
  • the bow loading station 9 is provided with two decks 16 and 19, one placed above the other, and both placed on the top of the bow upper deck 17. Each deck of the bow loading station 9 is dedicated for a distinct and particular function.
  • the fluid connection deck 16 is dedicated to the connection of the tanker 2 with the fluid transfer lines 3.
  • FIG. 4A the receiving places 18 for fluid connectors are clearly shown.
  • FIG. 4B the tandem mooring offloading deck 19 is clearly shown with the mooring winches 28 and the hawsers fairleads 29.
  • This configuration has the advantage of optimizing the clearance between the transfer lines 3 and the hawsers 4 or other mooring equipment means used to moor the two vessels in a tandem configuration.
  • the floating tanker 2 is provided with a cofferdam 50 supporting the bow loading station 9 and offering an optimal layout where all mooring and handling elements are on the same deck 19 at a different higher level than the connecting elements which are at the fluid connection deck 16.
  • the mooring winches 28 can also be used as handling winches.
  • a hawser pick-up line or messenger line 4' is handled to the floating tanker 2. Once the messenger line 4' is onboard the tanker 2, it will pass through the fairleads 29, wraps around the sheave 39 and extends to be attached to the mooring winch 28 on the bow loading station 9. Once the two vessels are moored one to the other, the connection of the transfer lines 3 can start. A similar method as the one for the hawser connection is applied.
  • a messenger line is sent onboard the floating tanker 2, passes via the receiving spaces 18 for fluid connectors, then through a fairleads, wraps around the sheave 39 and extends to be attached to the mooring winch line.
  • the mooring winch 28 is then used to handle the connection of the transfer line 3 by winching away from the LNG FPSO the messenger line which is engaging a cable to which the connector of the fluid transfer line is attached.
  • This method enables to install each transfer line 3 independently one from the other.
  • the bow loading station 9 has a hammer head shape; however it can have any other type of shape such as a square, a rectangle, as long as the visibility required to manoeuver and to handle the vessel is guaranteed.
  • FIG. 5A and 5B show different views of a storage reel 6 having a cross section showing flat sections according to one possible embodiment of the present invention.
  • the flat sections enable to accommodate the cryogenic hose end fitting.
  • the rigid end terminations 31 being stored on a flat surface 32.
  • FIG. 6A shows a possible embodiment for the draining of the fluid transfer line before disconnection where the vapor return is by-passed, for the hot gas to be directed into the fluid transfer lines and push the remaining fluid out.
  • FIG. 6B shows an alternative to the method shown in FIG. 6A where the hot gas is blown directly through one of the fluid transfer lines in order to push the remaining fluid out through the other fluid transfer line.
  • a vapor return line is required to handle the boil-off gas.
  • a bypass between the fluid product lines and the vapor return line can be used to improve the duration of the cargo transfer operations such as the cooldown, purging and inerting operations.
  • closing valves 40, 41 and 42 will create a bypass between the fluid product lines and the vapor return line.
  • the hot gas is directed into the fluid transfer lines and will hence push the remaining fluid out of the lines. It can be done for all lines at the same time or, only for a group of lines (when there are more than two fluid product lines) or for one fluid product line at a time.
  • valve 40 can stay open, and valves 41 and 42 must be closed.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Claims (16)

  1. Système de déchargement cryogénique offshore qui repose dans une mer présentant une surface et un fond marin, dans lequel du fluide cryogénique est transféré entre deux unités flottantes dans une configuration allant de la proue vers la poupe, ledit système comprenant :
    - une structure flottante (1) qui repose au niveau de la surface de la mer et comprend des unités de traitement,
    - un navire-citerne flottant (2) qui repose au niveau de la surface de la mer et transporte les fluides cryogéniques d'un emplacement à un autre,
    ledit navire-citerne ayant au moins une station de chargement avant ;
    - au moins une conduite de transfert cryogénique (3b, 3c) qui s'étend depuis la poupe de ladite structure flottante (1) vers la proue dudit navire-citerne flottant (2) pour transporter des fluides cryogéniques de l'un à l'autre ;
    - au moins une conduite de transfert servant de conduite de retour de vapeur (3a) qui s'étend depuis la poupe de ladite structure flottante (1) vers la proue dudit navire-citerne flottant (2) pour transporter la vapeur d'évaporation du navire-citerne flottant (2) vers la structure flottante (1) dans des opérations normales ;
    dans lequel la proue du navire-citerne flottant (2) est pourvue d'un niveau supplémentaire comprenant un pont de raccordement fluidique (16) placé au sommet d'un pont supérieur avant (17),
    caractérisé en ce que
    la proue du navire-citerne flottant (2) est pourvue d'un troisième niveau comprenant un pont de déchargement à amarrage en tandem (19) placé au-dessus du pont de raccordement fluidique (16) pour permettre aux deux unités flottantes (1, 2) d'être amarrées de manière détachable l'une à l'autre,
    dans lequel l'ensemble des éléments d'amarrage et de manoeuvre sont placés sur la station de chargement avant au niveau du pont de déchargement à amarrage en tandem (19) à un niveau différent de celui des éléments de raccordement fluidique qui sont au niveau du pont de raccordement fluidique (16).
  2. Système de déchargement cryogénique offshore selon la revendication 1, dans lequel au moins le navire-citerne flottant (2) est pourvu d'un positionnement dynamique.
  3. Système de déchargement cryogénique offshore selon l'une quelconque des revendications précédentes, dans lequel le navire-citerne (2) est pourvu d'un bulbe relocalisable (20).
  4. Système de déchargement cryogénique offshore selon la revendication 1 ou 2, dans lequel la structure flottante (1) est pourvue d'un système de commande de cap.
  5. Système de déchargement cryogénique offshore selon l'une quelconque des revendications précédentes, dans lequel au moins une conduite d'amarrage s'étend du fond marin pour amarrer la structure flottante.
  6. Système de déchargement cryogénique offshore selon l'une quelconque des revendications précédentes, dans lequel il existe un raccord fluidique de tuyau cryogénique (21) par conduite de transfert cryogénique (3a, 3b, 3c) installée sur la station de chargement avant (9).
  7. Système de déchargement cryogénique offshore selon la revendication 6, dans lequel chaque raccord fluidique de tuyau cryogénique (21) est pourvu de moyens de débranchement d'urgence.
  8. Système de déchargement cryogénique offshore selon la revendication 6 ou 7, dans lequel chaque raccord fluidique de tuyau cryogénique (21) est combiné avec un raccord structurel (23) fournissant des moyens de dérivation de charge.
  9. Système de déchargement cryogénique offshore selon la revendication 1, dans lequel il existe un treuil de traction (28) par conduite de transfert (3a, 3b, 3c) installé sur la station de chargement avant (9).
  10. Système de déchargement cryogénique offshore selon la revendication 9, dans lequel les treuils de traction (28) sont également utilisés en tant que treuils de manoeuvre.
  11. Système de déchargement cryogénique offshore selon l'une quelconque des revendications précédentes, dans lequel la structure flottante (1) est pourvue d'un touret de stockage (6) par conduite de transfert (3) placé au niveau de la poupe de la structure flottante (1).
  12. Système de déchargement cryogénique offshore selon la revendication 11, dans lequel la structure flottante (1) est pourvue d'au moins un des tourets de stockage (6) ayant une section transversale présentant des sections plates (32) pour loger les embouts de tuyaux cryogéniques (31).
  13. Système de déchargement cryogénique offshore selon l'une quelconque des revendications précédentes, dans lequel chaque conduite de transfert (3a, 3b, 3c) est pourvue d'un élément de flottabilité (11) au moins proche de l'extrémité devant être soulevée et branchée.
  14. Système de déchargement cryogénique offshore selon l'une quelconque des revendications précédentes, dans lequel la structure flottante (1) et le navire-citerne flottant (2) sont dans une configuration de déchargement en tandem asymétrique.
  15. Procédé de transfert de GNL dans une configuration de la proue à la poupe entre deux structures flottantes (1) et un navire-citerne flottant (2) dans un système de déchargement cryogénique offshore selon l'une quelconque des revendications précédentes.
  16. Procédé de transfert de GNL selon la revendication 15, dans lequel chaque conduite de transfert (3a, 3b, 3c) est installée indépendamment des autres.
EP11702475.2A 2010-02-10 2011-02-10 Station de chargement avant à double pont pour liquide cryogénique Not-in-force EP2534040B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11702475.2A EP2534040B1 (fr) 2010-02-10 2011-02-10 Station de chargement avant à double pont pour liquide cryogénique

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10153175 2010-02-10
EP11702475.2A EP2534040B1 (fr) 2010-02-10 2011-02-10 Station de chargement avant à double pont pour liquide cryogénique
PCT/EP2011/051976 WO2011098527A1 (fr) 2010-02-10 2011-02-10 Station de chargement avant à double pont pour liquide cryogénique

Publications (2)

Publication Number Publication Date
EP2534040A1 EP2534040A1 (fr) 2012-12-19
EP2534040B1 true EP2534040B1 (fr) 2018-05-16

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Application Number Title Priority Date Filing Date
EP11702475.2A Not-in-force EP2534040B1 (fr) 2010-02-10 2011-02-10 Station de chargement avant à double pont pour liquide cryogénique

Country Status (6)

Country Link
EP (1) EP2534040B1 (fr)
AU (1) AU2011214362B2 (fr)
BR (1) BR112012019480B1 (fr)
MY (1) MY175026A (fr)
RU (1) RU2570854C2 (fr)
WO (1) WO2011098527A1 (fr)

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CN107416136A (zh) * 2017-06-29 2017-12-01 武汉船用机械有限责任公司 一种适用于纵向补给的输油软管连接方法

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WO2013068561A1 (fr) * 2011-11-10 2013-05-16 Single Buoy Moorings Inc. Station de rinçage de gnl offshore
AU2013204835B2 (en) * 2012-09-03 2016-11-10 Seacaptaur Ip Ltd Vessel
KR101738027B1 (ko) * 2014-02-25 2017-05-22 익셀러레이트 에너지 리미티드 파트너쉽 직렬 해양의 화물 전달을 위한 수축 가능 lng 화물 전달 선수 매니폴드
CN104085705A (zh) * 2014-06-23 2014-10-08 中国海洋石油总公司 一种基于转盘式软管的flng串靠外输设备
CN104071306A (zh) * 2014-06-23 2014-10-01 中国海洋石油总公司 一种基于转盘式刚性管的flng串靠外输设备
CN104590493B (zh) * 2015-02-15 2017-03-01 中国人民解放军总后勤部油料研究所 一种近岸无码头油轮输转油系统
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Also Published As

Publication number Publication date
RU2570854C2 (ru) 2015-12-10
RU2012138450A (ru) 2014-03-20
AU2011214362A1 (en) 2012-08-16
BR112012019480B1 (pt) 2021-05-18
WO2011098527A1 (fr) 2011-08-18
BR112012019480A2 (pt) 2018-03-27
MY175026A (en) 2020-06-03
EP2534040A1 (fr) 2012-12-19
AU2011214362B2 (en) 2016-06-09

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